What was found
BOTH CABIN DOORS CORRODED BEYOND REPAIR (CESSNA FACTORY INSULATION). COLLECTED MOISTURE AND CORRODED INSIDE OF DOOR AT THE BOTTOM FORWARD SIDE. NO WAY TO INSPECT AREA WITHOUT DRILLING A BIGGER HOLE. NO FACTORY DRAIN HOLES WERE IN THIS AREA. ACFT WAS ALWAYS HANGARED. NEVER FLEW IN THE RAIN. MOISTURE MAY HAVE BEEN CAUSE BY WASHING ACFT. NO OTHER SITES OF CORROSION ON THIS ACFT. SUBMITTER RECOMMENDS REMOVING ALL FACTORY INSULATION FROM ALL AREAS OF ACFT.